Question

Find the value of cos1395

Answer 1

cos 1395
= cos (3 × 360 + 315)
= cos 315
= cos (360 - 45)
= cos 45
= 1/2√2

Answer 2

Answer:

cos(1395°)

= cos(3×360°+315°)

= cos315°

= cos(360°-45°)

= cos45°

= $\frac{1}{ \sqrt{2} }$

Step-by-step explanation:

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